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% morehelp.sty version 0.1 1997 by Olaf Kummer
%
% see morehelp.README for explanations
%
\NeedsTeXFormat{LaTeX2e}[1997/12/01]
\ProvidesPackage{morehelp}[1997/02/18 More Help Package V0.1]
% Save the original definition.
\let\morehelp@latex@error=\@latex@error
% Define some auxillary macros.
\def\morehelp@iftrue{\iftrue}
\def\morehelp@iffalse{\iffalse}
% It is helpful to distinguish the first error.
\newif\if@additional@error
\@additional@errorfalse
% Check if the second argument is a prefix of the
% first argument. Arguments are delimited by plus signs.
\def\morehelp@ifmatches#1#2+#3#4+{%
\def\morehelp@a{#1}%
\def\morehelp@b{#2}%
\def\morehelp@c{#3}%
\def\morehelp@d{#4}%
\ifx\morehelp@d\@empty
\ifx\morehelp@a\morehelp@c
\def\morehelp@return{\morehelp@iftrue}%
\else
\def\morehelp@return{\morehelp@iffalse}%
\fi
\else\ifx\morehelp@b\@empty
\def\morehelp@return{\morehelp@iffalse}%
\else\ifx\morehelp@a\morehelp@c
\def\morehelp@return{%
\expandafter\expandafter\expandafter\morehelp@ifmatches
\expandafter\morehelp@b\expandafter+\morehelp@d+}%
\else
\def\morehelp@return{\morehelp@iffalse}%
\fi\fi\fi
\morehelp@return
}
% Check if the first argument is a prefix of the
% current error message. If yes, replace the current
% help message by the second argument.
\def\morehelp@try@#1#2#3{%
% Is this the error message we are looking for?
\expandafter\morehelp@ifmatches\morehelp@msg.+#2+%
% Yes, but is it helpful?
#1\morehelp@a{#3}%
\ifx\morehelp@a\@empty\else
% Replace the help message.
\let\morehelp@help=\morehelp@a%
\fi
\fi
}
% The help text is given as is, without choices.
\def\morehelp@try{\morehelp@try@\def}
% The help text is expandable and will try some tricks to be more precise.
\def\morehelp@try@expand{\morehelp@try@\edef}
% Redefine the internal error handling routine of LateX.
\def\@latex@error#1#2{%
% Are we on safe ground?
\ifx\protect\relax
{% Yes, proceed with analysis.
% Inhibit looping.
\let\@latex@error=\morehelp@latex@error
% Keep track of the actual error.
\def\morehelp@msg{#1}%
\let\morehelp@help\@empty%
% See if we can find a better help message.
%
% We read the file with the messages now. Slower and somewhat
% more error prone than reading it ahead of time, but
% more memory efficient.
\makeatletter
\@@input morehelp.eng\relax
\makeatother
% Now we output the error.
\ifx\morehelp@help\@empty
\@latex@error{#1}{#2}
\else
\GenericError{%
\space\space\space\@spaces\@spaces\@spaces
}{%
LaTeX Error: #1%
}{%
\morehelp@help.^^J^^J%
See the LaTeX manual or LaTeX Companion for further explanation.%
}{#2}%
\fi
\@additional@errortrue
}%
\else
% No, we might run into trouble. Better be invisible.
\morehelp@afterfi\morehelp@latex@error{#1}{#2}%
\fi
}
\let\@latexerr\@latex@error
% Try to catch the most obvious catcode error.
\def\morehelp@a{\spacefactor\@m}
\def\morehelp@afterelse#1\else#2\fi{\fi#1}
\def\morehelp@afterfi#1\fi{\fi#1}
\ifx\morehelp@a\@%
% Nobody clobbered \@, so we try to redefine it.
\def\@{%
% Are we ok?
\ifhmode
% Yes, probably the user knows what to do.
\morehelp@afterelse\spacefactor\@m
\else
\expandafter\morehelp@atcommand
\fi
}
\begingroup
\makeatother
\expandafter\global\expandafter\let\csname morehelp@atsign\endcsname=@
\endgroup
\def\morehelp@atcommand{%
\ifx\morehelp@modefor@err\undefined
\@@input morehelp.dyn\relax
\fi
\morehelp@atcommand
}
\fi
|
